Under optimal conditions, the growth of a certain strain of \(E\). Coli is
modeled by the Law of Uninhibited Growth \(N(t)=N_{0} e^{k t}\) where \(N_{0}\) is
the initial number of bacteria and \(t\) is the elapsed time, measured in
minutes. From numerous experiments, it has been determined that the doubling
time of this organism is 20 minutes. Suppose 1000 bacteria are present
initially.
(a) Find the growth constant \(k\). Round your answer to four decimal places.
(b) Find a function which gives the number of bacteria \(N(t)\) after \(t\)
minutes.
(c) How long until there are 9000 bacteria? Round your answer to the nearest
minute.